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Development of Voltammetric Sensor for Determination of Tryptophan Using MWCNTs‐modified Sol‐gel Electrode
Author(s) -
Majidi Mir Reza,
Salimi Arezu,
Alipour Esmaeel
Publication year - 2013
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201300248
Subject(s) - chemistry , tryptophan , electrode , cyclic voltammetry , detection limit , differential pulse voltammetry , electrochemistry , carbon nanotube , anode , electrochemical gas sensor , voltammetry , peak current , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , chromatography , nanotechnology , materials science , biochemistry , amino acid
In the present work, an electrochemical sensor was developed for simple and sensitive determination of tryptophan (Trp) using multi‐walled carbon nanotubes modified sol‐gel electrode (MWCNTs/SGE). The electrocatalytic oxidation of tryptophan was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). It was found that the oxidation peak current of Trp at the MWCNTs/SGE was greatly improved compared with that of the bare SGE. Furthermore, at the MWCNTs/SGE, the anodic peak potential of Trp is shifted about 220 mV to more negative value indicated that modified electrode has better electrocatalytic activity for electro‐oxidation of Trp. The anodic peak currents increased linearly with the concentration of tryptophan in the range of 0.2 × 10 −6 to 15 × 10 −6 M with a detection limit of 0.139 × 10 −6 M (at an S/N = 3).